I am not sure what you mean by bound. If you are referring to the hedron rings that held them in place during BFZ, I would say no. Premending walkers had near godly power, and while I am sure they were restricted in some way, it was more likely it was through some sort of spell cast by one of the planeswalkers. I don't think the topic was explicitly discussed by wizards tho.

December 5, 2017
2:53 p.m.

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